WO2017023135A1 - Procédé et appareil de génération d'un signal stf à l'aide d'une séquence binaire dans un rle sans fil - Google Patents

Procédé et appareil de génération d'un signal stf à l'aide d'une séquence binaire dans un rle sans fil Download PDF

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WO2017023135A1
WO2017023135A1 PCT/KR2016/008627 KR2016008627W WO2017023135A1 WO 2017023135 A1 WO2017023135 A1 WO 2017023135A1 KR 2016008627 W KR2016008627 W KR 2016008627W WO 2017023135 A1 WO2017023135 A1 WO 2017023135A1
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Prior art keywords
stf
sequence
tone
mhz
ppdu
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PCT/KR2016/008627
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English (en)
Korean (ko)
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박은성
최진수
조한규
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엘지전자 주식회사
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Priority to US15/516,346 priority Critical patent/US10320590B2/en
Publication of WO2017023135A1 publication Critical patent/WO2017023135A1/fr
Priority to US16/404,062 priority patent/US10897380B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0031—Multiple signaling transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26132—Structure of the reference signals using repetition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation

Definitions

  • the present disclosure relates to a technique for generating a sequence for a training field in a WLAN system, and more particularly, to a method and apparatus for generating a short training field (STF) sequence usable for multiple bands in a WLAN system.
  • STF short training field
  • next-generation WLANs 1) enhancements to the Institute of Electronics and Electronics Engineers (IEEE) 802.11 physical physical access (PHY) and medium access control (MAC) layers in the 2.4 GHz and 5 GHz bands, and 2) spectral efficiency and area throughput. aims to improve performance in real indoor and outdoor environments, such as in environments where interference sources exist, dense heterogeneous network environments, and high user loads.
  • IEEE Institute of Electronics and Electronics Engineers
  • PHY physical physical access
  • MAC medium access control
  • next-generation WLAN The environment mainly considered in the next-generation WLAN is a dense environment having many access points (APs) and a station (STA), and improvements in spectral efficiency and area throughput are discussed in such a dense environment.
  • next generation WLAN there is an interest in improving practical performance not only in an indoor environment but also in an outdoor environment, which is not much considered in a conventional WLAN.
  • next-generation WLAN there is a great interest in scenarios such as wireless office, smart home, stadium, hotspot, building / apartment, and AP based on the scenario.
  • STA are discussing about improving system performance in a dense environment with many STAs.
  • next-generation WLAN In addition, in the next-generation WLAN, there will be more discussion about improving system performance in outdoor overlapping basic service set (OBSS) environment, improving outdoor environment performance, and cellular offloading, rather than improving single link performance in one basic service set (BSS). It is expected.
  • the directionality of these next-generation WLANs means that next-generation WLANs will increasingly have a technology range similar to that of mobile communications. Considering the recent situation in which mobile communication and WLAN technology are discussed together in the small cell and direct-to-direct (D2D) communication area, the technical and business convergence of next-generation WLAN and mobile communication is expected to become more active.
  • D2D direct-to-direct
  • the present specification proposes a method and apparatus for configuring a sequence used for a training field in a WLAN system.
  • One example of the present specification proposes a technique for improving the problem of a sequence for a STF field presented in the prior art.
  • An example of the present specification proposes a transmission method applicable to a WLAN system, and specifically, a method and apparatus for generating an STF signal supporting at least one of a plurality of frequency bands supported in a WLAN system.
  • a transmitter generates a short training field (STF) signal corresponding to a first frequency band, and transmits a physical protocol data unit (PPDU) including the STF signal.
  • STF short training field
  • PPDU physical protocol data unit
  • the STF signal corresponding to the first frequency band may be generated based on a sequence in which a predetermined M sequence is repeated.
  • the repeated sequence is ⁇ M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M ⁇ * (1 + j) / Can be defined as sqrt (2).
  • the preset M sequence may be a binary sequence having a length of 15 bits.
  • the generation technique of the STF signal proposed in the example of the present specification solves the problem of the conventionally presented technique.
  • WLAN wireless local area network
  • FIG. 2 is a diagram illustrating an example of a PPDU used in the IEEE standard.
  • FIG. 3 is a diagram illustrating an example of a HE PPDU.
  • FIG. 4 is a diagram illustrating an arrangement of resource units (RUs) used on a 20 MHz band.
  • FIG. 5 is a diagram illustrating an arrangement of resource units (RUs) used on a 40 MHz band.
  • FIG. 6 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.
  • FIG. 7 is a diagram illustrating another example of the HE-PPDU.
  • FIG. 8 is a block diagram showing an example of the HE-SIG-B according to the present embodiment.
  • FIG. 9 shows an example of a trigger frame.
  • FIG 11 illustrates an example of subfields included in an individual user information field.
  • FIG. 12 is a block diagram illustrating an example of an uplink MU PPDU.
  • FIG. 13 shows a 1x HE-STF tone in channel-specific PPDU transmission according to this embodiment.
  • FIG. 14 shows an example of a 2x HE-STF tone in channel-specific PPDU transmission according to the present embodiment.
  • FIG. 16 illustrates an example of the repeated structure of FIG. 15.
  • FIG. 18 is an example in which the repeated structure of FIG. 17 is further embodied.
  • 19 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 20 MHz band.
  • 20 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 40 MHz band.
  • FIG. 21 is a diagram showing PAPRs of the above-described examples in units of RU used in the left band of the 80 MHz band.
  • FIG. 22 is a diagram showing PAPRs of the above-described examples in units of RU used in the right band of the 80 MHz band.
  • FIG. 24 is an example in which the repeated structure of FIG. 23 is further embodied.
  • FIG. 25 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 20 MHz band.
  • FIG. 26 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 40 MHz band.
  • FIG. 27 is a diagram showing PAPRs of the above-described examples in units of RU used in the left band of the 80 MHz band.
  • FIG. 28 is a diagram showing PAPRs of the above-described examples in units of RU used in the right band of the 80 MHz band.
  • 29 is a flowchart of a procedure to which the above-described example is applicable.
  • FIG. 30 is a block diagram illustrating a wireless device to which an embodiment can be applied.
  • WLAN wireless local area network
  • BSS infrastructure basic service set
  • IEEE Institute of Electrical and Electronic Engineers
  • the WLAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter, BSS).
  • BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area.
  • the BSS 105 may include one or more joinable STAs 105-1 and 105-2 to one AP 130.
  • the BSS may include at least one STA, APs 125 and 130 for providing a distribution service, and a distribution system (DS) 110 for connecting a plurality of APs.
  • STA STA
  • APs 125 and 130 for providing a distribution service
  • DS distribution system
  • the distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set.
  • ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110.
  • APs included in one ESS 140 may have the same service set identification (SSID).
  • the portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).
  • a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130.
  • a network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
  • FIG. 1 is a conceptual diagram illustrating an IBSS.
  • the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-4, and 155-5 are managed in a distributed manner. In the IBSS, all STAs 150-1, 150-2, 150-3, 155-4, and 155-5 may be mobile STAs, and access to a distributed system is not allowed, thus making a self-contained network. network).
  • a STA is any functional medium that includes medium access control (MAC) conforming to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard and a physical layer interface to a wireless medium. May be used to mean both an AP and a non-AP STA (Non-AP Station).
  • MAC medium access control
  • IEEE Institute of Electrical and Electronics Engineers
  • the STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit or simply a user.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • UE mobile subscriber unit
  • It may also be called various names such as a mobile subscriber unit or simply a user.
  • the term "user” may be used in various meanings, for example, may also be used to mean an STA participating in uplink MU MIMO and / or uplink OFDMA transmission in wireless LAN communication. It is not limited to this.
  • FIG. 2 is a diagram illustrating an example of a PPDU used in the IEEE standard.
  • PPDUs PHY protocol data units
  • LTF and STF fields included training signals
  • SIG-A and SIG-B included control information for the receiving station
  • data fields included user data corresponding to the PSDU.
  • This embodiment proposes an improved technique for the signal (or control information field) used for the data field of the PPDU.
  • the signal proposed in this embodiment may be applied on a high efficiency PPDU (HE PPDU) according to the IEEE 802.11ax standard. That is, the signals to be improved in the present embodiment may be HE-SIG-A and / or HE-SIG-B included in the HE PPDU. Each of HE-SIG-A and HE-SIG-B may also be represented as SIG-A or SIG-B.
  • the improved signal proposed by this embodiment is not necessarily limited to the HE-SIG-A and / or HE-SIG-B standard, and controls / control of various names including control information in a wireless communication system for transmitting user data. Applicable to data fields.
  • FIG. 3 is a diagram illustrating an example of a HE PPDU.
  • the control information field proposed in this embodiment may be HE-SIG-B included in the HE PPDU as shown in FIG. 3.
  • the HE PPDU according to FIG. 3 is an example of a PPDU for multiple users.
  • the HE-SIG-B may be included only for the multi-user, and the HE-SIG-B may be omitted in the PPDU for the single user.
  • a HE-PPDU for a multiple user includes a legacy-short training field (L-STF), a legacy-long training field (L-LTF), a legacy-signal (L-SIG), High efficiency-signal A (HE-SIG-A), high efficiency-signal-B (HE-SIG-B), high efficiency-short training field (HE-STF), high efficiency-long training field (HE-LTF) It may include a data field (or MAC payload) and a PE (Packet Extension) field. Each field may be transmitted during the time period shown (ie, 4 or 8 ms, etc.).
  • FIG. 4 is a diagram illustrating an arrangement of resource units (RUs) used on a 20 MHz band.
  • resource units corresponding to different numbers of tones (ie, subcarriers) may be used to configure some fields of the HE-PPDU.
  • resources may be allocated in units of RUs shown for HE-STF, HE-LTF, and data fields.
  • 26-units ie, units corresponding to 26 tones
  • Six tones may be used as the guard band in the leftmost band of the 20 MHz band, and five tones may be used as the guard band in the rightmost band of the 20 MHz band.
  • seven DC tones are inserted into the center band, that is, the DC band, and 26-units corresponding to each of the 13 tones may exist to the left and right of the DC band.
  • other bands may be allocated 26-unit, 52-unit, 106-unit. Each unit can be assigned for a receiving station, i. E. A user.
  • the RU arrangement of FIG. 4 is utilized not only for the situation for a plurality of users (MU), but also for the situation for a single user (SU), in which case one 242-unit is shown as shown at the bottom of FIG. It is possible to use and in this case three DC tones can be inserted.
  • FIG. 5 is a diagram illustrating an arrangement of resource units (RUs) used on a 40 MHz band.
  • the example of FIG. 5 may also use 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like.
  • five DC tones can be inserted at the center frequency, 12 tones are used as the guard band in the leftmost band of the 40 MHz band, and 11 tones are in the rightmost band of the 40 MHz band. This guard band can be used.
  • the 484-RU may be used when used for a single user. Meanwhile, the specific number of RUs may be changed as in the example of FIG. 4.
  • FIG. 6 is a diagram illustrating an arrangement of resource units (RUs) used on an 80 MHz band.
  • the example of FIG. 6 may also use 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, and the like. have.
  • seven or five DC tones can be inserted at the center frequency, and 12 tones are used as the guard band in the leftmost band of the 80 MHz band, and in the rightmost band of the 80 MHz band. Eleven tones can be used as guard bands.
  • 996-RU may be used when used for a single user. Meanwhile, the specific number of RUs may be changed as in the example of FIGS. 4 and 5.
  • FIG. 7 is a diagram illustrating another example of the HE-PPDU.
  • FIG. 7 is another example illustrating the HE-PPDU block of FIG. 3 in terms of frequency.
  • the illustrated L-STF 700 may include a short training orthogonal frequency division multiplexing symbol.
  • the L-STF 700 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.
  • AGC automatic gain control
  • the L-LTF 710 may include a long training orthogonal frequency division multiplexing symbol.
  • the L-LTF 710 may be used for fine frequency / time synchronization and channel prediction.
  • L-SIG 720 may be used to transmit control information.
  • the L-SIG 720 may include information about a data rate and a data length.
  • the L-SIG 720 may be repeatedly transmitted. That is, the L-SIG 720 may be configured in a repeating format (for example, may be referred to as an R-LSIG).
  • the HE-SIG-A 730 may include control information common to the receiving station.
  • the HE-SIG-A 730 may include 1) a DL / UL indicator, 2) a BSS color field which is an identifier of a BSS, 3) a field indicating a remaining time of a current TXOP interval, 4) 20, Bandwidth field indicating whether 40, 80, 160, 80 + 80 MHz, 5) field indicating the MCS scheme applied to HE-SIG-B, 6) HE-SIB-B has dual subcarrier modulation for MCS ( field indicating whether it is modulated by dual subcarrier modulation), 7) field indicating the number of symbols used for HE-SIG-B, and 8) indicating whether HE-SIG-B is generated over the entire band.
  • PE Packet Extension
  • CRC field of the HE-SIG-A and the like.
  • Specific fields of the HE-SIG-A may be added or omitted. In addition, some fields may be added or omitted in other environments where the HE-SIG-A is not a multi-user (MU) environment.
  • MU multi-user
  • the HE-SIG-B 740 may be included only when it is a PPDU for a multi-user (MU) as described above.
  • the HE-SIG-A 750 or the HE-SIG-B 760 may include resource allocation information (or virtual resource allocation information) for at least one receiving STA.
  • FIG. 8 is a block diagram showing an example of the HE-SIG-B according to the present embodiment.
  • the HE-SIG-B field includes a common field at the beginning, and the common field can be encoded separately from the following field. That is, as shown in FIG. 8, the HE-SIG-B field may include a common field including common control information and a user-specific field including user-specific control information.
  • the common field may include a corresponding CRC field and may be coded into one BCC block. Subsequent user-specific fields may be coded into one BCC block, including a "user-feature field" for two users and a corresponding CRC field, as shown.
  • the previous field of the HE-SIG-B 740 on the MU PPDU may be transmitted in duplicated form.
  • the HE-SIG-B 740 transmitted in a part of the frequency band (for example, the fourth frequency band) is the frequency band (that is, the fourth frequency band) of the Control information for a data field and a data field of another frequency band (eg, the second frequency band) except for the corresponding frequency band may be included.
  • the HE-SIG-B 740 of a specific frequency band (eg, the second frequency band) duplicates the HE-SIG-B 740 of another frequency band (eg, the fourth frequency band). It can be one format.
  • the HE-SIG-B 740 may be transmitted in an encoded form on all transmission resources.
  • the field after the HE-SIG-B 740 may include individual information for each receiving STA that receives the PPDU.
  • the HE-STF 750 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment.
  • MIMO multiple input multiple output
  • OFDMA orthogonal frequency division multiple access
  • the HE-LTF 760 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the size of the FFT / IFFT applied to the field after the HE-STF 750 and the HE-STF 750 may be different from the size of the FFT / IFFT applied to the field before the HE-STF 750.
  • the size of the FFT / IFFT applied to the fields after the HE-STF 750 and the HE-STF 750 may be four times larger than the size of the IFFT applied to the field before the HE-STF 750.
  • a field of s is called a first field
  • at least one of the data field 770, the HE-STF 750, and the HE-LTF 760 may be referred to as a second field.
  • the first field may include a field related to a legacy system
  • the second field may include a field related to a HE system.
  • the FFT / IFFT size may be selected one of 1, 2, and 4 times, and may be selectively determined according to channel conditions or configuration information from another communication device.
  • 256 FFT / IFFT is applied for a bandwidth of 20 MHz
  • 512 FFT / IFFT is applied for a bandwidth of 40 MHz
  • 1024 FFT / IFFT is applied for a bandwidth of 80 MHz
  • 2048 FFT for a bandwidth of 160 MHz continuous or discontinuous 160 MHz.
  • / IFFT can be applied.
  • a subcarrier spacing of 312.5 kHz which is a conventional subcarrier spacing, may be applied to a first field of the HE PPDU, and a subcarrier space of 78.125 kHz may be applied to a second field of the HE PPDU.
  • the length of an OFDM symbol may be a value obtained by adding a length of a guard interval (GI) to an IDFT / DFT length.
  • the length of the GI can be various values such as 0.4 ⁇ s, 0.8 ⁇ s, 1.6 ⁇ s, 2.4 ⁇ s, 3.2 ⁇ s.
  • a feature in which the size of the FFT / IFFT applied to the fields after the HE-STF 750 and the HE-STF 750 may be variously set may be applied to the downlink PPDU and / or the uplink PPDU. That is, it may be applied to the PPDU shown in FIG. 7 or the uplink MU PPDU described later.
  • the frequency band used by the first field and the frequency band used by the second field are represented in FIG. 7, they may not exactly coincide with each other.
  • the main band of the first field L-STF, L-LTF, L-SIG, HE-SIG-A, HE-SIG-B
  • HE-STF the main band of the first field
  • HE-LTF, Data the second field
  • the interface may be inconsistent. 4 to 6, since a plurality of null subcarriers, DC tones, guard tones, etc. are inserted in the process of arranging the RU, it may be difficult to accurately match the interface.
  • the user may receive the HE-SIG-A 730 and may be instructed to receive the downlink PPDU based on the HE-SIG-A 730.
  • the STA may perform decoding based on the changed FFT size from the field after the HE-STF 750 and the HE-STF 750.
  • the STA may stop decoding and configure a network allocation vector (NAV).
  • NAV network allocation vector
  • the cyclic prefix (CP) of the HE-STF 750 may have a larger size than the CP of another field, and during this CP period, the STA may perform decoding on the downlink PPDU by changing the FFT size.
  • data (or frame) transmitted from the AP to the STA is called downlink data (or downlink frame), and data (or frame) transmitted from the STA to the AP is called uplink data (or uplink frame).
  • downlink data or downlink frame
  • uplink data or uplink frame
  • the transmission from the AP to the STA may be expressed in terms of downlink transmission
  • the transmission from the STA to the AP may be expressed in terms of uplink transmission.
  • each of the PHY protocol data units (PPDUs), frames, and data transmitted through downlink transmission may be expressed in terms of a downlink PPDU, a downlink frame, and downlink data.
  • the PPDU may be a data unit including a PPDU header and a physical layer service data unit (PSDU) (or MAC protocol data unit (MPDU)).
  • PSDU physical layer service data unit
  • MPDU MAC protocol data unit
  • the PPDU header may include a PHY header and a PHY preamble
  • the PSDU (or MPDU) may be a data unit including a frame (or an information unit of a MAC layer) or indicating a frame.
  • the PHY header may be referred to as a physical layer convergence protocol (PLCP) header in another term
  • the PHY preamble may be expressed as a PLCP preamble in another term.
  • each of the PPDUs, frames, and data transmitted through uplink transmission may be represented by the term uplink PPDU, uplink frame, and uplink data.
  • the entire bandwidth may be used for downlink transmission to one STA and uplink transmission of one STA based on single (or single) -orthogonal frequency division multiplexing (SUDM) transmission.
  • the AP may perform downlink (DL) multi-user (MU) transmission based on MU MIMO (multiple input multiple output), and such transmission is DL MU MIMO transmission. It can be expressed as.
  • an orthogonal frequency division multiple access (OFDMA) based transmission method is preferably supported for uplink transmission and / or downlink transmission. That is, uplink / downlink communication may be performed by allocating data units (eg, RUs) corresponding to different frequency resources to the user.
  • the AP may perform DL MU transmission based on OFDMA, and such transmission may be expressed by the term DL MU OFDMA transmission.
  • the AP may transmit downlink data (or downlink frame, downlink PPDU) to each of the plurality of STAs through the plurality of frequency resources on the overlapped time resources.
  • the plurality of frequency resources may be a plurality of subbands (or subchannels) or a plurality of resource units (RUs).
  • DL MU OFDMA transmission can be used with DL MU MIMO transmission. For example, DL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) is performed on a specific subband (or subchannel) allocated for DL MU OFDMA transmission. Can be.
  • UL MU transmission uplink multi-user transmission
  • a plurality of STAs transmit data to the AP on the same time resource.
  • Uplink transmission on the overlapped time resource by each of the plurality of STAs may be performed in a frequency domain or a spatial domain.
  • different frequency resources may be allocated as uplink transmission resources for each of the plurality of STAs based on OFDMA.
  • the different frequency resources may be different subbands (or subchannels) or different resource units (RUs).
  • Each of the plurality of STAs may transmit uplink data to the AP through different allocated frequency resources.
  • the transmission method through these different frequency resources may be represented by the term UL MU OFDMA transmission method.
  • each of the plurality of STAs When uplink transmission by each of the plurality of STAs is performed in the spatial domain, different space-time streams (or spatial streams) are allocated to each of the plurality of STAs, and each of the plurality of STAs transmits uplink data through different space-time streams. Can transmit to the AP.
  • the transmission method through these different spatial streams may be represented by the term UL MU MIMO transmission method.
  • the UL MU OFDMA transmission and the UL MU MIMO transmission may be performed together.
  • UL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) may be performed on a specific subband (or subchannel) allocated for UL MU OFDMA transmission.
  • a multi-channel allocation method was used to allocate a wider bandwidth (for example, a bandwidth exceeding 20 MHz) to one UE.
  • the multi-channel may include a plurality of 20 MHz channels when one channel unit is 20 MHz.
  • a primary channel rule is used to allocate a wide bandwidth to the terminal. If the primary channel rule is used, there is a constraint for allocating a wide bandwidth to the terminal.
  • the primary channel rule when a secondary channel adjacent to the primary channel is used in an overlapped BSS (OBSS) and 'busy', the STA may use the remaining channels except the primary channel. Can't.
  • OBSS overlapped BSS
  • the STA can transmit the frame only through the primary channel, thereby being limited to the transmission of the frame through the multi-channel. That is, the primary channel rule used for multi-channel allocation in the existing WLAN system may be a big limitation in obtaining high throughput by operating a wide bandwidth in the current WLAN environment where there are not many OBSS.
  • a WLAN system supporting the OFDMA technology supporting the OFDMA technology. That is, the above-described OFDMA technique is applicable to at least one of downlink and uplink.
  • the above-described MU-MIMO technique may be additionally applied to at least one of downlink and uplink.
  • OFDMA technology is used, a plurality of terminals may be used simultaneously instead of one terminal without using a primary channel rule. Therefore, wide bandwidth operation is possible, and the efficiency of the operation of radio resources can be improved.
  • the AP when uplink transmission by each of a plurality of STAs (eg, non-AP STAs) is performed in the frequency domain, the AP has different frequency resources for each of the plurality of STAs based on OFDMA. It may be allocated as a link transmission resource. In addition, as described above, different frequency resources may be different subbands (or subchannels) or different resource units (RUs).
  • OFDMA orthogonal frequency division multiple access
  • Different frequency resources for each of the plurality of STAs are indicated through a trigger frame.
  • the trigger frame of FIG. 9 allocates resources for uplink multiple-user transmission and can be transmitted from the AP.
  • the trigger frame may consist of a MAC frame and may be included in a PPDU. For example, it may be transmitted through the PPDU shown in FIG. 3, through the legacy PPDU shown in FIG. 2, or through a PPDU specifically designed for the trigger frame. If transmitted through the PPDU of FIG. 3, the trigger frame may be included in the illustrated data field.
  • Each field shown in FIG. 9 may be partially omitted, and another field may be added. In addition, the length of each field may be varied as shown.
  • the frame control field 910 of FIG. 9 includes information about the version of the MAC protocol and other additional control information, and the duration field 920 includes time information for setting the NAV described below.
  • Information about an identifier (eg, AID) of the terminal may be included.
  • the RA field 930 includes address information of the receiving STA of the corresponding trigger frame and may be omitted as necessary.
  • the TA field 940 includes address information of an STA (for example, an AP) that transmits a corresponding trigger frame, and the common information field 950 is common to be applied to a receiving STA that receives the corresponding trigger frame. Contains control information
  • FIG. 10 shows an example of a common information field. Some of the subfields of FIG. 10 may be omitted, and other subfields may be added. In addition, the length of each illustrated subfield may be modified.
  • the illustrated length field 1010 has the same value as the length field of the L-SIG field of the uplink PPDU transmitted corresponding to the trigger frame, and the length field of the L-SIG field of the uplink PPDU indicates the length of the uplink PPDU.
  • the length field 1010 of the trigger frame may be used to indicate the length of the corresponding uplink PPDU.
  • the cascade indicator field 1020 indicates whether a cascade operation is performed.
  • the cascade operation means that downlink MU transmission and uplink MU transmission are performed together in the same TXOP. That is, after downlink MU transmission is performed, it means that uplink MU transmission is performed after a predetermined time (eg, SIFS).
  • a predetermined time eg, SIFS.
  • only one transmitting device (eg, AP) for downlink communication may exist, and a plurality of transmitting devices (eg, non-AP) for uplink communication may exist.
  • the CS request field 1030 indicates whether the state of the radio medium, the NAV, or the like should be considered in a situation in which the receiving apparatus receiving the trigger frame transmits the corresponding uplink PPDU.
  • the HE-SIG-A information field 1040 may include information for controlling the content of the SIG-A field (ie, the HE-SIG-A field) of the uplink PPDU transmitted in response to the corresponding trigger frame.
  • the CP and LTF type field 1050 may include information about the length of the LTF and the CP length of the uplink PPDU transmitted in response to the corresponding trigger frame.
  • the trigger type field 1060 may indicate the purpose for which the corresponding trigger frame is used, for example, normal triggering, triggering for beamforming, a request for Block ACK / NACK, and the like.
  • per user information fields 960 # 1 to 960 # N corresponding to the number of receiving STAs receiving the trigger frame of FIG. 9.
  • the individual user information field may be called a “RU assignment field”.
  • the trigger frame of FIG. 9 may include a padding field 970 and a frame check sequence field 980.
  • Each of the per user information fields 960 # 1 to 960 # N shown in FIG. 9 preferably includes a plurality of subfields.
  • FIG. 11 illustrates an example of subfields included in an individual user information field. Some of the subfields of FIG. 11 may be omitted, and other subfields may be added. In addition, the length of each illustrated subfield may be modified.
  • the user identifier field 1110 of FIG. 11 indicates an identifier of an STA (ie, a receiving STA) to which per user information corresponds.
  • An example of the identifier may be all or part of an AID. have.
  • the RU Allocation field 1120 may be included. That is, when the receiving STA identified by the user identifier field 1110 transmits an uplink PPDU in response to the trigger frame of FIG. 9, the corresponding uplink PPDU through the RU indicated by the RU Allocation field 1120. Send.
  • the RU indicated by the RU Allocation field 1120 preferably indicates the RUs shown in FIGS. 4, 5, and 6.
  • the subfield of FIG. 11 may include a coding type field 1130.
  • the coding type field 1130 may indicate a coding type of an uplink PPDU transmitted in response to the trigger frame of FIG. 9. For example, when BCC coding is applied to the uplink PPDU, the coding type field 1130 is set to '1', and when LDPC coding is applied, the coding type field 1130 is set to '0'. Can be.
  • the subfield of FIG. 11 may include an MCS field 1140.
  • the MCS field 1140 may indicate an MCS scheme applied to an uplink PPDU transmitted in response to the trigger frame of FIG. 9. For example, when BCC coding is applied to the uplink PPDU, the coding type field 1130 is set to '1', and when LDPC coding is applied, the coding type field 1130 is set to '0'. Can be.
  • FIG. 12 is a block diagram illustrating an example of an uplink MU PPDU.
  • the uplink MU PPDU of FIG. 12 may be transmitted in response to the above-described trigger frame.
  • the PPDU of FIG. 12 includes various fields, each field corresponding to the fields shown in FIGS. 2, 3, and 7. Meanwhile, as shown, the uplink PPDU of FIG. 12 may include only the HE-SIG-A field and not the HE-SIG-B field.
  • FIG. 13 shows a 1x HE-STF tone in channel-specific PPDU transmission according to this embodiment. More specifically, FIG. 13 illustrates a HE-STF tone (i.e. 16 tone sampling) with a 0.8 Hz period in the 20 MHz / 40 MHz / 80 MHz bandwidth. Accordingly, in FIG. 13, HE-STF tones for each bandwidth (or channel) may be located at 16 tone intervals.
  • the x-axis represents a frequency domain.
  • the number on the x-axis represents the index of the tone, and the arrow indicates the non-zero mapping to that tone index.
  • FIG. 13A shows an example of a 1x HE-STF tone in a 20 MHz PPDU transmission.
  • the 1x HE-STF sequence is a tone index from -112 to 112.
  • the 1x HE-STF tone may be located at a tone index that is a multiple of 16 except for DC among tones having a tone index from -112 to 112. Accordingly, 14 1x HE-STF tones to which a 1x HE-STF sequence is mapped may exist in a 20 MHz channel.
  • Sub-blot (b) shows an example of a 1 ⁇ HE-STF tone in a 40 MHz PPDU transmission.
  • the 1x HE-STF sequence is a tone index from -240 to 240.
  • the tones having a tone mapped to a tone having a tone index that is a multiple of 16 excluding DC 0 may be mapped to the remaining tones. That is, in the 40 MHz channel, the 1x HE-STF tone may be located at a tone index that is a multiple of 16 except for DC among tones having a tone index from -240 to 240. Therefore, a total of 30 1x HE-STF tones to which a 1x HE-STF sequence is mapped may exist in a 40MHz channel.
  • Sub-figure (c) shows an example of a 1x HE-STF tone in an 80 MHz PPDU transmission.
  • the 1x HE-STF sequence is a tone index from -496 to 496.
  • the tones having a tone mapped to a tone having a tone index that is a multiple of 16 excluding DC 0 may be mapped to the remaining tones. That is, in the 80 MHz channel, the 1x HE-STF tone may be located at a tone index that is a multiple of 16 except for DC among tones having a tone index from -496 to 496. Accordingly, there may be a total of 62 1x HE-STF tones to which a 1x HE-STF sequence is mapped in an 80MHz channel.
  • FIG. 14 shows an example of a 2x HE-STF tone in channel-specific PPDU transmission according to the present embodiment. More specifically, FIG. 14 illustrates a HE-STF tone (i.e., 8 tone sampling) with a 1.6 ms period in the 20 MHz / 40 MHz / 80 MHz bandwidth. Accordingly, in FIG. 14, HE-STF tones for each bandwidth (or channel) may be located at eight tone intervals.
  • the 2x HE-STF signal according to FIG. 14 may be applied to the uplink MU PPDU shown in FIG. 12. That is, the PPDU transmitted through the uplink corresponding to the above-described trigger frame may include the 2x HE-STF signal shown in FIG. 14.
  • the x axis represents a frequency domain.
  • the number on the x-axis represents the index of the tone, and the arrow indicates the non-zero mapping to that tone index.
  • FIG. 14A is a diagram illustrating a 2x HE-STF tone in a 20 MHz PPDU transmission.
  • a HE-STF sequence for a 1.6 ms period i.e., a 2x HE-STF sequence
  • the 2x HE-STF sequence is a tone index from -120 to 120.
  • the tones having a tone mapped to a tone having a tone index that is a multiple of 8 except for DC 0 may be mapped to the remaining tones. That is, in the 20 MHz channel, the 2x HE-STF tone may be located at a tone index that is a multiple of 8 except for DC among tones having a tone index from -120 to 120. Therefore, a total of 30 2x HE-STF tones to which a 2x HE-STF sequence is mapped may exist in a 20MHz channel.
  • Sub-batch (b) is a diagram illustrating a 2x HE-STF tone in a 40 MHz PPDU transmission.
  • a HE-STF sequence for a 1.6 ms period i.e., a 2x HE-STF sequence
  • the 2x HE-STF sequence is a tone index from -248 to 248.
  • the tones having a tone mapped to a tone having a tone index that is a multiple of 8 except for DC 0 may be mapped to the remaining tones. That is, in the 40 MHz channel, the 2x HE-STF tone may be located at a tone index that is a multiple of 8 except DC among tones having a tone index from -248 to 248.
  • tones having a tone index ⁇ 248 may correspond to guard tones (left and right guard tones) and may be nulled (ie, may have a value of 0). Accordingly, there may be a total of 60 2x HE-STF tones to which a 2x HE-STF sequence is mapped in a 40MHz channel.
  • Sub- Figure (c) is a diagram illustrating a 2x HE-STF tone in an 80 MHz PPDU transmission.
  • the 2x HE-STF sequence is a tone index from -504 to 504.
  • the tones having a tone mapped to a tone having a tone index that is a multiple of 8 except for DC 0 may be mapped to the remaining tones. That is, in the 80 MHz channel, the 2x HE-STF tone may be located at a tone index that is a multiple of 8 except for DC among tones having a tone index from ⁇ 504 to 504.
  • tones having a tone index ⁇ 504 correspond to guard tones (left and light guard tones) and may be nulled (that is, may have a value of zero). Accordingly, a total of 124 2x HE-STF tones to which a 2x HE-STF sequence is mapped may exist in an 80 MHz channel.
  • a sequence applicable to 1x HE-STF tones ie, sampling at 16 tone intervals
  • a sequence applicable to 2x HE-STF tones ie, sampling at 8 tone intervals
  • M sequence used in the following example is preferably a sequence having a length of 15.
  • M sequence is composed of a binary sequence (binary sequence) it is desirable to reduce the complexity when decoding.
  • An example of the present embodiment described below may generate an STF sequence supporting various frequency bandwidths by repeating an M sequence which is a binary sequence.
  • 15 is preferably applied to 1x HE-STF.
  • Equation 1 Equation 1
  • HE_STF_20 MHz (-112: 16: +112) ⁇ M ⁇
  • the A1 value means the frequency tone index to which the first element of the M sequence corresponds
  • the A3 value means the frequency tone index to which the last element of the M sequence corresponds.
  • the value of A2 means the interval of frequency tones in which each element of the M sequence is disposed.
  • Equation 1 the first element of the M sequence corresponds to the frequency band corresponding to the index “-112”, the last element of the M sequence corresponds to the frequency band corresponding to the index “+112”, and Each element is arranged at 16 frequency tone intervals.
  • the value "0" corresponds to the frequency band corresponding to the index "0”. That is, Equation 1 has a structure corresponding to the sub-view (a) of FIG.
  • Equation 2 Equation 2 below. That is, ⁇ M, 0, M ⁇ may be utilized to extend the structure of Equation 1 to the 40 MHz band.
  • HE_STF_40 MHz (-240: 16: 240) ⁇ M, 0, M ⁇
  • Equation 2 shows that 15 M sequence elements are arranged in 16 frequency tone intervals from a frequency band corresponding to index “-240” to a frequency band corresponding to “-16”, and “0” is arranged for frequency index 0.
  • 15 M sequence elements are arranged in 16 frequency tone intervals from the frequency band corresponding to “+16” to the frequency band corresponding to “+240”.
  • Equation 3 When the STF sequence for 80 MHz shown in FIG. 15 is expressed by Equation 3, it can be expressed as Equation 3 below. That is, ⁇ M, 0, M, 0, M, 0, M ⁇ may be utilized to extend the structure of Equation 1 to the 80 MHz band.
  • HE_STF_80 MHz (-496: 16: 496) ⁇ M, 0, M, 0, M, 0, M ⁇
  • Equation 3 shows that 15 M sequence elements are arranged at intervals of 16 frequency tones from a frequency band corresponding to index "-496" to a frequency band corresponding to "-272", and in a frequency band corresponding to index "-256".
  • “0” (or any additional value a1) is arranged, and 15 M sequence elements are arranged in 16 frequency tone intervals from the frequency band corresponding to “-240” to the frequency band corresponding to “-16”, and the frequency For index 0, "0” is arranged.
  • 15 M sequence elements are arranged at intervals of 16 frequency tones from a frequency band corresponding to index “+16” to a frequency band corresponding to “+240” and “0” (in a frequency band corresponding to “+256”).
  • any additional value a2) is arranged, and from "+272" to "+496", M sequence elements are arranged in 16 frequency tone intervals.
  • PAPR should be considered without consideration.
  • the PAPR should be calculated based on the entire band (for example, the entire band shown in FIGS. 4 to 6).
  • the PAPR should be calculated in consideration of each unit (eg, the individual 26-RU, 52-RU, 106-RU, etc. shown in FIGS. 4 to 6).
  • FIG. 16 illustrates an example of the repeated structure of FIG. 15.
  • coefficients of c1 to c7 may be reflected, (1 + j) * sqrt (1/2) and the like may also be reflected, and additional values such as a1 and a2 may be applied.
  • the M sequence used basically may be determined as shown in Equation 4.
  • M ⁇ -1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1 ⁇
  • the STF sequences for the 20 MHz and 40 MHz bands may be determined as in the following equations.
  • HE_STF_20 MHz (-112: 16: 112) M * (1 + j) / sqrt (2)
  • HE_STF_40 MHz (-240: 16: 240) ⁇ M, 0, -M ⁇ * (1 + j) / sqrt (2)
  • the STF sequence for the 80 MHz band can be determined by any one of the following equations.
  • Equations 4 to 8 may be modified to another example as follows.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • Equation 9 may be applied to all or part of Equations 5 to 8. For example, it is possible to use the basic sequence of Equation 9 based on the structure of Equation 7.
  • the PAPR is calculated based on the entire band (for example, the entire band shown in FIGS. 4 to 6).
  • the PAPR for the example in which Equation 4 is applied to the structure of Equation 5 is 2.33
  • the PAPR for the example in which Equation 4 is applied to the structure of Equation 6 is 4.40
  • Equation 4 is expressed in Equation 7 or 8
  • the PAPR for the example applied to this structure is 4.49.
  • the PAPR for the example in which Equation 9 is applied to the structure of Equation 5 is 1.89
  • the PAPR for the example in which Equation 9 is applied to the structure of Equation 6 is 4.40
  • Equation 9 is expressed as Equation 7 or 8.
  • the PAPR for the example applied to the structure is 4.53.
  • the presented STF sequences show a fine PAPR performance difference, compared to the conventional sequence, it is preferable to use any one of the presented examples for uplink and / or downlink communication.
  • One example of this embodiment described below is preferably applied to 2x HE-STF.
  • HE_STF_20 MHz (-120: 8: +120) ⁇ M, 0, M ⁇
  • FIG. 18 is an example in which the repeated structure of FIG. 17 is further embodied.
  • coefficients of c1 to c14 may be reflected, (1 + j) * sqrt (1/2) and the like may also be reflected, and additional values such as a1 to a8 may be applied.
  • the M sequence used basically may be determined as shown in Equation 13.
  • M ⁇ -1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1 ⁇
  • the STF sequence for the 20MHz, 40MHz, 80MHz band can be determined as shown in the following equations.
  • HE_STF_20 MHz (-120: 8: 120) ⁇ M, 0, -M ⁇ * (1 + j) / sqrt (2)
  • Equations 14 to 16 may be modified to another example as follows.
  • Equation 17 the M sequence that is basically used may be modified as shown in Equation 17.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the 2x HE-STF sequence for the 20 MHz band may be generated by applying Equation 17 to Equation 14.
  • the 2x HE-STF sequence for the 40 MHz band may be generated by applying Equation 17 to the following Equation.
  • the 2x HE-STF sequence for the 80MHz band may be generated by applying Equation 17 to the following Equation.
  • 19 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 20 MHz band.
  • Each block shown in FIG. 19 represents a 26-RU, 52-RU, 106-RU, 242-RU shown in FIG. 4.
  • the first block 1910 represents the leftmost 26-RU shown in FIG. 4
  • the second block 1920 represents the center 26-RU shown in FIG. 4
  • the third block 1930 represents 52-RU
  • fourth block 1940 represents 106-RU
  • fifth block 1950 represents 242-RU.
  • FIG. 20 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 40 MHz band. That is, each block shown in FIG. 20 represents 26-RU, 52-RU, 106-RU, 242-RU, and 484-RU shown in FIG. 5.
  • FIG. 21 is a diagram showing PAPRs of the above-described examples in units of RU used in the left band of the 80 MHz band.
  • 22 is a diagram showing PAPRs of the above-described examples in units of RU used in the right band of the 80 MHz band. That is, each block illustrated in FIGS. 21 and 22 represents 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and 996-RU shown in FIG. 6.
  • the PAPR of Example (B-1) is 1.94
  • the PAPR of Example (B-2) is 1.94. to be.
  • PAPR of an example (B-1) is 4.97
  • PAPR of an example (B-2) is 5.77 with respect to the whole band
  • HE_STF_20 MHz (-120: 8: +120) ⁇ M, 0, M ⁇
  • HE_STF_40 MHz (-240: 8: 240) ⁇ M, M, 0, M, M ⁇
  • FIG. 24 is an example in which the repeated structure of FIG. 23 is further embodied.
  • coefficients of c1 to c14 may be reflected, (1 + j) * sqrt (1/2) and the like may also be reflected, and additional values such as a1 to a4 may be applied.
  • an example of an STF sequence optimized from a PAPR perspective is as follows.
  • the M sequence basically used may be determined as shown in Equation 23.
  • M ⁇ -1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1 ⁇
  • the STF sequences for the 40 MHz and 80 MHz bands may be determined as in the following equations. Since the STF sequence for the 20 MHz band is the same as in the example (B) (that is, the same as in Equation 14), the display is omitted.
  • Equations 24 to 26 may be modified to another example as follows.
  • Equation 27 the M sequence basically used may be modified as shown in Equation 27.
  • M ⁇ -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1 ⁇
  • the 2x HE-STF sequence for the 40 MHz and 80 MHz bands can be generated by adapting Equation 27 to the following Equation. Since the STF sequence for the 20 MHz band is the same as the example (B), the display is omitted.
  • FIG. 25 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 20 MHz band.
  • Each block shown in FIG. 25 represents a 26-RU, 52-RU, 106-RU, 242-RU shown in FIG. 4.
  • An example of the above-described equations (23) to (26) may be referred to as an example (C-1), and an example of the above-described equations (27) to (30) may be displayed as an example (C-2).
  • the numerical values indicated in each block represent the PAPR for the example (C-1) and the example (C-2).
  • FIG. 26 is a diagram illustrating PAPR of the above-described examples in units of RU used in a 40 MHz band. That is, each block shown in FIG. 26 represents 26-RU, 52-RU, 106-RU, 242-RU, and 484-RU shown in FIG. 5.
  • FIG. 27 is a diagram showing PAPRs of the above-described examples in units of RU used in the left band of the 80 MHz band.
  • FIG. 28 is a diagram showing PAPRs of the above-described examples in units of RU used in the right band of the 80 MHz band. That is, each block shown in FIGS. 27 and 28 represents 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and 996-RU shown in FIG. 6.
  • the PAPR of Example (C-1) is 1.94
  • the PAPR of Example (C-2) is 6.02. to be.
  • PAPR of an example (C-1) is 4.99
  • PAPR of an example (C-2) is 5.42 with respect to the whole band.
  • 29 is a flowchart of a procedure to which the above-described example is applicable.
  • FIG. 29 may be applied to various transmission apparatuses, for example, to a user apparatus (ie, a non-AP STA).
  • a user apparatus ie, a non-AP STA.
  • the transmitter determines whether to transmit a 1x HE-STF signal or a 2x HE STF signal. For example, in response to the trigger frame shown in FIG. 9, when transmitting the uplink PPDU shown in FIG. 12, a 2x HE STF signal may be transmitted. Otherwise, the 1x HE STF signal may be transmitted. have.
  • a 2X HE-STF signal may be generated according to step S2920.
  • the STF signal corresponding to the first frequency band may be configured by repeating a preset M sequence. Can be generated based on the sequence.
  • the repeated sequence is ⁇ M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M ⁇ * (1+ j) / sqrt (2).
  • the sequence is arranged at 8 ton intervals from the lowest tone having a tone index -504 to the highest tone having a tone index +504, wherein the ⁇ M, -1, M, -1, -M, -1, M
  • the elements corresponding to tone indices -504 and 504 in the sequence 0, -M, 1, M, 1, -M, 1, -M ⁇ * (1 + j) / sqrt (2) can be nulled.
  • step S2920 at least one of the 2x HE-STF signals presented in the above example (B) or example (C) may be used.
  • the 1X HE-STF signal may be generated according to step S2930.
  • at least one of the 1x HE-STF signals presented in the above example (A) may be used.
  • step S2940 the generated HE-STF signal is transmitted to the receiving device.
  • FIG. 30 is a block diagram illustrating a wireless device to which an embodiment can be applied.
  • the wireless device may be an AP or a non-AP station (STA) that may implement the above-described embodiment.
  • the wireless device may correspond to the above-described user or may correspond to a transmission device for transmitting a signal to the user.
  • the AP 3000 includes a processor 3010, a memory 3020, and an RF unit 3030.
  • the RF unit 3030 may be connected to the processor 3010 to transmit / receive a radio signal.
  • the processor 3010 may implement the functions, processes, and / or methods proposed herein.
  • the processor 3010 may perform an operation according to the above-described embodiment. That is, the processor 3010 may perform an operation that may be performed by the AP during the operations disclosed in the embodiments of FIGS. 1 to 29.
  • the non-AP STA 3050 includes a processor 3060, a memory 3070, and an RF unit 3080.
  • the RF unit 3080 may be connected to the processor 3060 to transmit / receive a radio signal.
  • the processor 3060 may implement the functions, processes, and / or methods proposed in this embodiment.
  • the processor 3060 may be implemented to perform the non-AP STA operation according to the present embodiment described above.
  • the processor may perform the operation of the non-AP STA in the embodiment of FIGS. 1 to 29.
  • Processors 3010 and 3060 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters that interconvert baseband signals and wireless signals.
  • the memories 3020 and 3070 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
  • the RF unit 3030 and 3080 may include one or more antennas for transmitting and / or receiving a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memories 3020 and 3070 and executed by the processors 3010 and 3060.
  • the memories 3020 and 3070 may be inside or outside the processors 3010 and 3060 and may be connected to the processors 3010 and 3060 by various well-known means.

Abstract

L'invention concerne un procédé et un appareil de génération d'un signal STF (champ d'entraînement court) utilisable dans un système de réseau local (RLE) sans fil. Ce signal STF est inclus dans un champ utilisé pour améliorer l'estimation de commande automatique de gain (CAG) d'une transmission MIMO. Une partie du signal STF est utilisée pour transmettre une liaison montante, et peut être utilisée pour des unités PPDU de multiutilisateur (MU) de liaison montante transmises à partir d'une pluralité de stations (STA). Le signal STF qui est proposé, par exemple, est utilisé pour une bande de 40 MHz ou de 80 MHz et peut être généré sur la base d'une séquence dans laquelle une séquence M prédéterminée est répétée. La séquence M prédéterminée peut être une séquence binaire dont la longueur est de 15 bits.
PCT/KR2016/008627 2015-08-06 2016-08-05 Procédé et appareil de génération d'un signal stf à l'aide d'une séquence binaire dans un rle sans fil WO2017023135A1 (fr)

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US16/404,062 US10897380B2 (en) 2015-08-06 2019-05-06 Method and apparatus for generating STF signal using binary sequence in wireless LAN system

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US201562202124P 2015-08-06 2015-08-06
US201562201586P 2015-08-06 2015-08-06
US62/201,586 2015-08-06
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US201562202165P 2015-08-07 2015-08-07
US62/202,165 2015-08-07

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US16/404,062 Continuation US10897380B2 (en) 2015-08-06 2019-05-06 Method and apparatus for generating STF signal using binary sequence in wireless LAN system

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